Best Digital Multimeter for Testing Voltage

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A digital multimeter reads voltage, and it also reads current, resistance and continuity. This roundup covers five meters from our research set that list AC or DC voltage ranges in their listing text. The set includes other multimeters and clamp meters, which we left out where the listing did not give a voltage figure we could compare.

Quick answer: for the highest listed voltage, the AstroAI 6000-count meter and the Fluke 17B+ both state 1000 V DC. For auto-ranging with a kickstand, the Klein MM420 and the AstroAI M4K0R both list auto-ranging. Pick the meter whose stated range covers the highest voltage you expect to read.

The five picks at a glance

Meter	Listed DC voltage	Listed AC voltage	CAT rating (as listed)
AstroAI True RMS 6000 Counts (B071JL6LLL)	up to 1000 V	up to 750 V	CAT III 600 V; CAT II 1000 V
Fluke 17B+ (B0779621KZ)	up to 1000 V	up to 1000 V	CAT III 600 V
Klein Tools MM420 (B0B57PFFYX)	up to 600 V	up to 600 V	CAT III 600 V
AstroAI TRMS 4000 Counts M4K0R (B08DHHJPS1)	up to 600 V	up to 600 V	CAT III 600 V
Klein Tools MM320KIT (B08W1THSM8)	up to 600 V	up to 600 V	Not stated

How we chose these five

We kept meters whose listing states a voltage range for both AC and DC, or for one of them with a clear figure, and whose text names the functions a shopper would expect. Each card below relays what the listing states. No meter was used or measured for this post, and nothing below reports personal use.

• Voltage range: the highest AC and DC figure the listing gives.
• Range mode: whether the listing says auto-ranging or manual ranging.
• Kit contents: what the listing says comes in the box.

1. AstroAI True RMS 6000 Counts Digital Multimeter

The title gives 6000 counts, and the listing states auto or manual range selection, so the meter can be set either way. The specification table gives DC voltage ranges of 600 mV, 6 V, 60 V, 600 V and 1000 V, and AC voltage ranges of 600 mV, 6 V, 60 V, 600 V and 750 V. Its digital display field reads 5999 with a 5 and three quarters digit display, which is one count below the title figure. The listing does not explain the difference. The weight appears twice with two values: the item weight field reads 492 g, and a separate weight field reads approximately 357 g. The listing states a safety rating of EN 61010-1 CAT III 600 V and CAT II 1000 V, a 9 V battery included, and dimensions of 190 by 90 by 35 mm. Ceramic fuses are listed as F400 mA/600 V and F10 A/600 V. Listing checked 12 October 2026.

Check the AstroAI True RMS 6000 Counts on Amazon

2. Fluke 17B+ Digital Multimeter

The listing states AC and DC voltage measurement up to 1000 V, current up to 10 A, and resistance, continuity, diode, capacitance, frequency and temperature functions. The temperature function is listed up to 400 C with the included type K thermocouple. The safety rating is CAT III 600 V, and the bullets describe the rating as suitable for common residential, commercial and industrial settings. The kit includes TL75 test leads and the K-type thermocouple assembly. Item weight is 470 g and the dimensions are 8.46 by 2.76 by 5.91 inches. The listing names a manufacturer warranty without giving a period. Listing checked 12 October 2026.

Check the Fluke 17B+ on Amazon

3. Klein Tools MM420 Auto-Ranging TRMS Digital Multimeter

The listing states 600 V AC and DC voltage, 10 A AC and DC current, and 50 MOhms resistance. It is auto-ranging and uses true root mean square measurement. Lead-alert LEDs light when the test leads are in the correct sockets, and the display is backlit. The listing says the back has test lead holders, a kickstand, and an optional magnetic hanger. It also states a 6.6 foot (2 m) drop rating. The specification field reads CAT III 600 V, and the weight is 14.56 ounces, with dimensions of 9.33 by 5.08 by 3.82 inches. The listing says the test leads are included. The warranty is listed as “call vendor”. Listing checked 12 October 2026.

Check the Klein MM420 on Amazon

4. AstroAI TRMS 4000 Counts Multimeter M4K0R

The listing states AC and DC voltage up to 600 V, current up to 10 A, and resistance up to 40 MΩ. It states a CAT III 600 V rating and a non-contact NCV function that sounds an alarm and shows a red light when a strong AC signal is sensed. A battery test covers 1.5 V, 9 V and 12 V cells. The meter uses two 1.5 V AAA batteries, and the listing says a pair of test leads is included. Item weight is 219 g and the dimensions are 5.87 by 2.8 by 1.38 inches. The listing mentions data hold, max reading, auto shut-off, a low battery indicator, a continuity buzzer, a backlit screen and a flashlight. Listing checked 12 October 2026.

Check the AstroAI M4K0R on Amazon

5. Klein Tools MM320KIT Digital Multimeter Test Kit

This is a kit. The meter is a manual ranging multimeter that the listing states measures up to 600 V AC and DC voltage and 10 A DC current. A bullet gives resistance as 2 ohm, and the listing does not explain that figure further. The kit includes an ET45 AC and DC voltage tester and a carrying case. A bullet says the ET45 tests AC from 28 V to 240 V and DC from 32 V to 330 V. A separate bullet says a non-contact voltage tester, NCVT3P, detects from 12 to 1000 V AC or 70 to 1000 V AC, with a built-in flashlight. The listing states batteries are included. Item weight is 1.6 pounds and the dimensions are 12.4 by 7.91 by 2.24 inches. The listing does not give a CAT rating for the meter. Listing checked 12 October 2026.

Check the Klein MM320KIT on Amazon

Worked example: which meter covers a 750 V AC reading?

Take a circuit that reads 750 V AC. Using only the listed AC figures, the AstroAI 6000-count meter lists 750 V AC, so the reading is at its top value. The Fluke 17B+ lists AC up to 1000 V, so 750 V sits inside its range. The Klein MM420, the AstroAI M4K0R and the Klein MM320KIT each list 600 V AC, so none of them covers a 750 V reading. Now take a 900 V DC reading. Only the AstroAI 6000-count meter and the Fluke 17B+ list DC above 600 V, and both state 1000 V DC as the top figure.

What the listings do not say

None of the five listings gives an independent figure for accuracy beyond the percentage figures shown in the specification tables, and the Klein listings give no battery life. The AstroAI 6000-count listing gives two weights and two counts, and the listing does not say which applies. The Klein MM320KIT lists resistance as 2 ohm without a range, which may not be the figure a shopper expects. Read the rating printed on the meter you receive before you rely on it.

Frequently asked questions

Which of these meters reads the highest DC voltage?

The AstroAI 6000-count meter and the Fluke 17B+ both state 1000 V DC. The Klein MM420, the AstroAI M4K0R and the Klein MM320KIT list 600 V DC.

What does auto-ranging mean in these listings?

The Klein MM420 and the AstroAI M4K0R state auto-ranging. The AstroAI 6000-count listing states auto or manual range selection. The Klein MM320KIT is described as a manual ranging meter.

Do these meters include test leads?

The Fluke 17B+ includes TL75 test leads, the Klein MM420 says its test leads are included, and the AstroAI M4K0R includes a pair of test leads. The AstroAI 6000-count listing does not name test leads in its included parts. The Klein MM320KIT kit includes an ET45 tester, a carrying case and batteries.

Do all five list continuity?

Each of the five listings names continuity as a function. The AstroAI M4K0R and the Klein MM320KIT kit also list a non-contact voltage function.

Why do the counts differ on the AstroAI 6000-count listing?

The title says 6000 counts, while the digital display field reads 5999 with a 5 and three quarters digit display. The listing does not explain the difference, so check the display on the meter you receive.

Conclusion

For the highest listed voltage, the AstroAI 6000-count meter and the Fluke 17B+ are the two to compare, since both state 1000 V DC. If you want auto-ranging with a kickstand, the Klein MM420 is the listing that states both. The AstroAI M4K0R adds a non-contact function and battery tests. Compare each listed range against the highest voltage you expect to read.

For more on meter types, see best multimeter, best auto ranging digital multimeter, and best hand held digital multimeter.

AstroAI 6000-count on Amazon · Fluke 17B+ on Amazon · Klein MM420 on Amazon · AstroAI M4K0R on Amazon · Klein MM320KIT on Amazon